Neuromagnetic evoked responses to complex motions are greatest for expansion

Ian E. Holliday, Timothy S. Meese

Research output: Contribution to journalArticle

Abstract

We analysed evoked magnetic responses to moving random dot stimuli, initially using a 19-channel magnetoencephalography (MEG) system, and subsequently using a 151-channel MEG system. Random dot displays were used to construct complex motion sequences, which we refer to as expansion, contraction, deformation, and rotation. We also investigated lateral translation and a condition in which the directions of the dots were randomised. In all stimulus conditions, the dots were first stationary, then traveled for a brief period (317s or 542 ms), and were then stationary again. In all conditions, evoked magnetic responses were observed with a widespread bilateral distribution over the observers' heads. Initial recordings revealed a substantially larger evoked magnetic response to the expansion condition than the other conditions. In a revised study, we used a 151-channel MEG system and two stimulus diameters (9.3 and 48 deg), the smaller comparable with the first experiment. The responses were analysed using a nonparametric approach and confirmed our initial observations. In a third study, speed gradients were removed and a new design permitted direct comparisons between motion conditions. The results from all three experiments are consistent with the greater ecological validity of the expansion stimulus. © 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)145-157
Number of pages13
JournalInternational Journal of Psychophysiology
Volume55
Issue number2
DOIs
Publication statusPublished - Feb 2005

Fingerprint

Magnetoencephalography
Head

Keywords

  • evoked potentials
  • human vision
  • motion perception
  • optic flow

Cite this

@article{b5126b3d181d4b14be084a4b44e111c7,
title = "Neuromagnetic evoked responses to complex motions are greatest for expansion",
abstract = "We analysed evoked magnetic responses to moving random dot stimuli, initially using a 19-channel magnetoencephalography (MEG) system, and subsequently using a 151-channel MEG system. Random dot displays were used to construct complex motion sequences, which we refer to as expansion, contraction, deformation, and rotation. We also investigated lateral translation and a condition in which the directions of the dots were randomised. In all stimulus conditions, the dots were first stationary, then traveled for a brief period (317s or 542 ms), and were then stationary again. In all conditions, evoked magnetic responses were observed with a widespread bilateral distribution over the observers' heads. Initial recordings revealed a substantially larger evoked magnetic response to the expansion condition than the other conditions. In a revised study, we used a 151-channel MEG system and two stimulus diameters (9.3 and 48 deg), the smaller comparable with the first experiment. The responses were analysed using a nonparametric approach and confirmed our initial observations. In a third study, speed gradients were removed and a new design permitted direct comparisons between motion conditions. The results from all three experiments are consistent with the greater ecological validity of the expansion stimulus. {\circledC} 2004 Elsevier B.V. All rights reserved.",
keywords = "evoked potentials, human vision, motion perception, optic flow",
author = "Holliday, {Ian E.} and Meese, {Timothy S.}",
year = "2005",
month = "2",
doi = "10.1016/j.ijpsycho.2004.07.009",
language = "English",
volume = "55",
pages = "145--157",
journal = "International Journal of Psychophysiology",
issn = "0167-8760",
publisher = "Elsevier",
number = "2",

}

Neuromagnetic evoked responses to complex motions are greatest for expansion. / Holliday, Ian E.; Meese, Timothy S.

In: International Journal of Psychophysiology, Vol. 55, No. 2, 02.2005, p. 145-157.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Neuromagnetic evoked responses to complex motions are greatest for expansion

AU - Holliday, Ian E.

AU - Meese, Timothy S.

PY - 2005/2

Y1 - 2005/2

N2 - We analysed evoked magnetic responses to moving random dot stimuli, initially using a 19-channel magnetoencephalography (MEG) system, and subsequently using a 151-channel MEG system. Random dot displays were used to construct complex motion sequences, which we refer to as expansion, contraction, deformation, and rotation. We also investigated lateral translation and a condition in which the directions of the dots were randomised. In all stimulus conditions, the dots were first stationary, then traveled for a brief period (317s or 542 ms), and were then stationary again. In all conditions, evoked magnetic responses were observed with a widespread bilateral distribution over the observers' heads. Initial recordings revealed a substantially larger evoked magnetic response to the expansion condition than the other conditions. In a revised study, we used a 151-channel MEG system and two stimulus diameters (9.3 and 48 deg), the smaller comparable with the first experiment. The responses were analysed using a nonparametric approach and confirmed our initial observations. In a third study, speed gradients were removed and a new design permitted direct comparisons between motion conditions. The results from all three experiments are consistent with the greater ecological validity of the expansion stimulus. © 2004 Elsevier B.V. All rights reserved.

AB - We analysed evoked magnetic responses to moving random dot stimuli, initially using a 19-channel magnetoencephalography (MEG) system, and subsequently using a 151-channel MEG system. Random dot displays were used to construct complex motion sequences, which we refer to as expansion, contraction, deformation, and rotation. We also investigated lateral translation and a condition in which the directions of the dots were randomised. In all stimulus conditions, the dots were first stationary, then traveled for a brief period (317s or 542 ms), and were then stationary again. In all conditions, evoked magnetic responses were observed with a widespread bilateral distribution over the observers' heads. Initial recordings revealed a substantially larger evoked magnetic response to the expansion condition than the other conditions. In a revised study, we used a 151-channel MEG system and two stimulus diameters (9.3 and 48 deg), the smaller comparable with the first experiment. The responses were analysed using a nonparametric approach and confirmed our initial observations. In a third study, speed gradients were removed and a new design permitted direct comparisons between motion conditions. The results from all three experiments are consistent with the greater ecological validity of the expansion stimulus. © 2004 Elsevier B.V. All rights reserved.

KW - evoked potentials

KW - human vision

KW - motion perception

KW - optic flow

UR - http://www.scopus.com/inward/record.url?scp=11844281562&partnerID=8YFLogxK

U2 - 10.1016/j.ijpsycho.2004.07.009

DO - 10.1016/j.ijpsycho.2004.07.009

M3 - Article

C2 - 15649546

VL - 55

SP - 145

EP - 157

JO - International Journal of Psychophysiology

JF - International Journal of Psychophysiology

SN - 0167-8760

IS - 2

ER -